Is there evidence for a 4.2 ka BP event in the northern North Atlantic region?

Type Article
Date 2019
Language English
Author(s) Bradley Raymond1, Bakke Jostein2
Affiliation(s) 1 : Department of Geosciences/Climate System Research Center, University of Massachusetts, Amherst, USA
2 : Department of Earth Science/Bjerknes Centre for Climate Research, University of Bergen, Norway
Source Climate of the Past (1814-9324) (Copernicus GmbH), 2019 , Vol. 15 , N. 5 , P. 1665-1676
DOI 10.5194/cp-2018-162
Note Special issue The 4.2 ka BP climatic event Editor(s): D.-D. Rousseau, G. Zanchetta, H. Weiss, M. Bini, and R.S. Bradley

We review paleoceanographic and paleoclimatic records from the northern North Atlantic to assess the nature of climatic conditions at 4.2 ka BP, which has been identified as a time of exceptional climatic anomalies in many parts of the world. The northern North Atlantic region experienced relatively warm conditions in the early Holocene (6–8 ka BP) followed by a general decline in temperatures after ~ 5 ka BP, which led to the onset of Neoglaciation. Although a few records do show a distinct anomaly around 4.2 ka BP (associated with a glacial advance), this is not widespread and we interpret it as a local manifestation of the overall climatic deterioration that characterizes the late Holocene.

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